Koch Chemie PFE PreFoam Efficient is the concentrated, phosphate-free, highly alkaline, foaming precleaner for car and truck prewash. The composition of complexing agents and surfactants spontaneously dissolves stubborn adhesions such as insects, bird excrement and environmental soiling. The good foam formation in combination with the fresh citrus scent ensures a pleasant washing experience. VDA-compliant class B: exposure time max. 1 min, max. application concentration 1:100.